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ASM3P2508A-08-SR Datasheet(PDF) 7 Page - Alliance Semiconductor Corporation |
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ASM3P2508A-08-SR Datasheet(HTML) 7 Page - Alliance Semiconductor Corporation |
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7 / 11 page  Peak EMI Reducing Solution 7 of 11 rev 1.3 February 2005 ASM3P2508A I2C Serial Interface Information The information in this section assumes familiarity with I2C programming. How to program ASM3P2508A through I2C: • Master (host) sends a start bit. • Master (host) sends the write address D4 (H). • ASM3P2508A device will acknowledge. • Master (host) sends the beginning byte location (N = 0, 1). • ASM3P2508A device will acknowledge. • Master (host) sends a byte count (X = 1,2) • ASM3P2508A device will acknowledge. • Master (host) starts sending byte N through byte (N+X – 1) • ASM3P2508A device will acknowledge each byte one at a time. • Master (host) sends a Stop bit. Controller (Host) ASM3P2508A (slave/receiver) Start Bit Slave Address D4(H) ACK Beginning byte location (=N) ACK Byte count (=X) ACK Beginning byte (Byte N) ACK Next Byte (Byte N+1) ACK ------- ---- Last Byte (Byte N+X-1) ACK Stop Bit How to Read from ASM3P2508A through I2C: • Master (host) will send start bit. • Master (host) sends the write address D4 (H). • ASM3P2508A device will acknowledge. • Master (host) sends the beginning byte location (N = 0, 1). • ASM3P2508A device will acknowledge. • Master (host) will send a separate start bit. • Master (host) sends the read address D5 (H). • ASM3P2508A device will acknowledge. • ASM3P2508A device will send the byte count (X = 1, 2). • Master (host) acknowledges. • ASM3P2508A device sends byte N through byte (N+X – 1). • Master (host) will need to acknowledge each byte. • Master (host) will send a stop bit. Controller (Host) ASM3P2508A (slave/receiver) Start Bit Slave Address D4(H) ACK Beginning Byte = N ACK Repeat start Slave address D5(H) ACK Byte Count (= X) ACK Beginning byte N ACK Next Byte N+1 ACK ---- ------- Last Byte (Byte N+X-1) Not Acknowledge Stop Bit |
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